US5290207A - Automatic tension adjuster for fan belt - Google Patents

Automatic tension adjuster for fan belt Download PDF

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Publication number
US5290207A
US5290207A US07/849,445 US84944592A US5290207A US 5290207 A US5290207 A US 5290207A US 84944592 A US84944592 A US 84944592A US 5290207 A US5290207 A US 5290207A
Authority
US
United States
Prior art keywords
end portion
lever
accordance
yoke
tension adjuster
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/849,445
Other languages
English (en)
Inventor
Yukio Yamamoto
Chukichi Nihei
Katsuya Fujimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KOMATSU SEISAKUSHO A CORP OF JAPAN KK
Komatsu Ltd
Original Assignee
Komatsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Assigned to KABUSHIKI KAISHA KOMATSU SEISAKUSHO, A CORP. OF JAPAN reassignment KABUSHIKI KAISHA KOMATSU SEISAKUSHO, A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HUGIMOTO, KATSUYA, NIHEI, CHUKICHI, YAMAMOTO, YUKIO
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes or chains 
    • F16H7/10—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1281—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes or chains 
    • F16H2007/0889—Path of movement of the finally actuated member
    • F16H2007/0893—Circular path

Definitions

  • the present invention relates to an automatic tension adjuster for a fan belt which adjusts the tension of a fan belt so as to prevent slip, so-called "creak” or the like from occurring between the fan belt and a crank pulley.
  • FIGS. 4 and 5 A conventional device for automatically adjusting the tension of a fan belt (an automatic tensioner) will be described with reference to FIGS. 4 and 5.
  • numeral 101 indicates a crank pulley, which is firmly attached to the tip end of the crankshaft of an engine (not shown).
  • Numeral 102 indicates a fan pulley, which is rotatably attached to the tip end of an shaft firmly attached to a bracket of an engine front cover (not shown), and to an end surface of which a fan 103 is attached.
  • Numeral 104 indicates a tension pulley, which is rotatably attached to the tip end of a lever 105 fitted onto a shaft section 106 firmly attached to the bracket of the engine front cover (not shown) and adapted to make a swing motion.
  • a coil spring 107 is wound around the shaft section 106 of the lever 105, and, by the reaction force of this coil spring, the tension pulley 104 is pushed against a belt 108, thereby imparting tension to the
  • the belt 108 is driven by the crank pulley 101, and, due to the resistance of the fan 103, a belt portion 108a receives a tensile force and tightens, whereas a belt portion 108b slackens.
  • the tension pulley 104 moves in the direction of the arrow F due to the action of the coil spring 107 attached to the shaft section 106, and pushes the belt portion 108b to impart tension thereto, so that no slackening occurs. If the engine suddenly accelerates, the acceleration time is long, so that the tension pulley 104 follows the belt portion 108b to impart tension thereto, thus preventing slackening.
  • the deceleration time is short, so that the tension pulley 104 cannot follow the belt portion 108b.
  • the fan pulley 102 on the driven side cannot decelerate rapidly due to the inertia of the fan 103, with the result that the fan pulley 102 is turned to the driving side and the crank pulley 101 to the driven side.
  • the belt portion 108a becomes the slack side, and the belt portion 108b the tight side.
  • the tension pulley 104 moves in the reverse direction R, thereby causing the belt portion 108a to further slacken.
  • the crank pulley 101 and the belt 108 become liable to slip and cause so-called "creak.”
  • the present invention has been made with a view to solving the above problem. It is accordingly an object of the present invention to provide an automatic tension adjuster for a fan belt which adjusts the tension of a fan belt even at the time of sudden decrease in speed of the engine so as to prevent slip, so-called "creak” or the like from occurring between the fan belt and a crank pulley.
  • an adjusting means for automatically adjusting an amount by which a swingable lever rotatably supporting a tension pulley at one end and having a coil spring swings in a direction opposite to that in which it pushes the tension pulley against the fan belt when the rotational speed of the crank pulley suddenly lowers as a result of sudden decrease in speed of the engine.
  • This adjusting means comprises a lever having a pin, a yoke having an elongated hole into which the pin is fitted with some play therebetween, an adjusting bolt threadedly engaged with the other end of this yoke, a lock nut for fastening this bolt onto the yoke, and a fixing bracket through which this adjusting bolt passes.
  • the above-mentioned lever swings in such a manner as to push the tension pulley against the fan belt to impart tension to the fan belt, so that no slackening occurs.
  • the rotational speed of the crank pulley also decelerates suddenly, and the abovementioned lever swings in a direction opposite to that in which it pushes the tension pulley.
  • the amount of swing motion is adjusted by the above-mentioned adjusting means, tension is imparted to the fan belt, so that no slackening occurs.
  • slip, so-called "creak” and the like are prevented from occurring between the fan belt and the crank pulley.
  • FIG. 1 is a conceptual diagram showing an arrangement of a pulley, belt, yoke, etc. according to the present invention
  • FIG. 2 is a partially cutaway view of an automatic tension adjuster for a fan belt according to the present invention in a stopped state or at the time of sudden deceleration;
  • FIG. 3 is a partially cutaway view of an automatic tension adjuster for a fan belt according to the present invention during normal operation or at the time of sudden acceleration;
  • FIG. 4 is a diagram illustrating a pulley, belt, etc. according to a prior-art technique in normal operating condition or at the time of sudden acceleration;
  • FIG. 5 is a diagram illustrating the pulley, belt, etc. according to the prior-art technique at the time of sudden deceleration.
  • numeral 1 indicates a crank pulley, which is firmly attached to the tip end of the crankshaft of an engine (not shown) and which serves as a drive source for transmitting the driving force of the engine to a fan.
  • Numeral 2 indicates a fan pulley, which is rotatably mounted on a shaft firmly attached to a bracket of an engine front cover (not shown), and to an end surface of which a fan 3 is attached.
  • Numeral 4 indicates a tension pulley, which is rotatably mounted on the tip end of a lever 5 fitted onto a shaft 6 firmly attached to the engine front cover bracket (not shown). A pin 9 is firmly attached to the other end of the lever 5. As shown in FIGS.
  • a torsion coil spring 7 is wound around the shaft 6 of the lever 5. Due to this arrangement, the lever 5 is biased in a clockwise direction, as seen in FIG. 1, so that the tension pulley 4 is pushed against the belt 8 to impart tension thereto. Further, firmly attached to the engine front cover (not shown) is a bracket 20 having a hole through which an adjusting bolt 13 passes.
  • the adjusting means 30 is attached to the pin 9 of the above-mentioned lever 5.
  • the adjusting means 30 comprises a yoke 10 having at one end an elongated hole 11 adapted to engage with the pin 9 with some play therebetween and at the other end a threaded section 12, an adjusting bolt 13 threadedly engaged with the threaded section 12 of this yoke, a lock nut 14 for fastening the adjusting bolt 13 to the yoke 10, and the bracket 20 through which the adjusting bolt 13 passes.
  • the belt 8 In the normal operating condition of the engine or at the time of sudden acceleration thereof, the belt 8 is driven by the crank pulley 1, and, due to the resistance of the fan 3, a belt portion 8a receives a tensile force to tighten, whereas a belt portion 8b slackens. However, due to the action of the coil spring 7 attached to the shaft 6 of the lever 5 tending to rotate the lever 5 in the clockwise direction (FIG. 1), the belt portion 8b is tightened by the tension pulley 4.
  • the deceleration time is short, and, although the crank pulley 1 on the driving side suddenly decelerates, the fan pulley 2 on the driven side cannot rapidly decelerate due to the inertia of the fan 3.
  • the fan pulley 2 is turned to the driving side, and the crank pulley 1 to the driven side, with the belt portion 8a slackening and the belt portion 8b tightening.
  • the tension pulley 4 is pulled to the side of the belt portion 8b, and tends to move in a direction to slacken the entire belt 8, i.e., the lever 5 tends to rotate counterclockwise as viewed in FIG.
  • the tension pulley 4 is not restricted in its movement during normal operation and at the time of sudden acceleration, and follows the belt 8 to prevent slackening.
  • the movement of the tension pulley 4 is restricted by the yoke 10 and the adjusting bolt 13, so that the belt 8 is prevented from slackening and the generation of slip, so-called "creak” and the like can be prevented.
  • a useful automatic tension adjuster for a fan belt which adjusts the tension of a fan belt so as to prevent slip, so-called “creak” or the like from occurring between the fan belt and a crank pulley.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
US07/849,445 1989-11-22 1990-11-14 Automatic tension adjuster for fan belt Expired - Lifetime US5290207A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1989135761U JPH085301Y2 (ja) 1989-11-22 1989-11-22 ファンベルトの張力自動調整装置
JP1-135761 1989-11-22
PCT/JP1990/001477 WO1991007611A1 (en) 1989-11-22 1990-11-14 Automatic tension adjuster for fan belt

Publications (1)

Publication Number Publication Date
US5290207A true US5290207A (en) 1994-03-01

Family

ID=15159249

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/849,445 Expired - Lifetime US5290207A (en) 1989-11-22 1990-11-14 Automatic tension adjuster for fan belt

Country Status (3)

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US (1) US5290207A (en))
JP (1) JPH085301Y2 (en))
WO (1) WO1991007611A1 (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5943986A (en) * 1998-02-06 1999-08-31 Generac Power Systems, Inc. Engine heat exchange apparatus with slide-mounted fan carrier assembly
EP0771969B1 (en) * 1995-11-01 2001-09-19 The Gates Corporation Tensioner with an adjustable stop for a power transmission belt and system
US20050159271A1 (en) * 2004-01-15 2005-07-21 Banta George L.Iii System for controlling engine crankshaft deceleration by limiting engine retarding torque

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2169510A (en) * 1938-10-22 1939-08-15 Frank A Wool Tension roller device and combination
FR977790A (fr) * 1942-11-13 1951-04-05 Applic Ind Nouvelles Perfectionnements apportés aux systèmes de transmission par courroies
US4069719A (en) * 1976-06-18 1978-01-24 Cancilla Philip S Chain tensioner for chain drives
JPS5681254A (en) * 1979-09-06 1981-07-03 Maschf Augsburg Nuernberg Ag Fuel injector for internal combustion engine
US4285676A (en) * 1979-12-17 1981-08-25 Dyneer Corporation Mechanical belt tensioner construction
EP0053954A1 (fr) * 1980-12-08 1982-06-16 Automobiles Peugeot Procédé et dispositif de mise en tension d'une courroie de transmission
US4713045A (en) * 1985-09-30 1987-12-15 Aisin Seiki Kabushiki Kaisha Auto-tensioner for belt systems and a method for adjusting tension degree
US4713044A (en) * 1985-09-09 1987-12-15 Nissan Motor Co., Ltd. Belt tensioner unit for internal combustion engine or the like
JPS6328950A (ja) * 1986-07-11 1988-02-06 合資会社　橋詰研究所 耳切ホイルカツタ−を装備したツイスト・セルビツジ形成装置
US4768997A (en) * 1987-03-10 1988-09-06 Tecumseh Products Company Belt drive system for dual input transmissions/transaxles

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4937682U (en)) * 1972-07-12 1974-04-03
JPS5453187U (en)) * 1977-09-22 1979-04-12
JPS54107736U (en)) * 1978-01-13 1979-07-28
JPS601317Y2 (ja) * 1979-11-21 1985-01-16 日本精工株式会社 テンシヨナ−
JPS6328950U (en)) * 1986-08-12 1988-02-25

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2169510A (en) * 1938-10-22 1939-08-15 Frank A Wool Tension roller device and combination
FR977790A (fr) * 1942-11-13 1951-04-05 Applic Ind Nouvelles Perfectionnements apportés aux systèmes de transmission par courroies
US4069719A (en) * 1976-06-18 1978-01-24 Cancilla Philip S Chain tensioner for chain drives
JPS5681254A (en) * 1979-09-06 1981-07-03 Maschf Augsburg Nuernberg Ag Fuel injector for internal combustion engine
US4285676A (en) * 1979-12-17 1981-08-25 Dyneer Corporation Mechanical belt tensioner construction
EP0053954A1 (fr) * 1980-12-08 1982-06-16 Automobiles Peugeot Procédé et dispositif de mise en tension d'une courroie de transmission
US4713044A (en) * 1985-09-09 1987-12-15 Nissan Motor Co., Ltd. Belt tensioner unit for internal combustion engine or the like
US4713045A (en) * 1985-09-30 1987-12-15 Aisin Seiki Kabushiki Kaisha Auto-tensioner for belt systems and a method for adjusting tension degree
JPS6328950A (ja) * 1986-07-11 1988-02-06 合資会社　橋詰研究所 耳切ホイルカツタ−を装備したツイスト・セルビツジ形成装置
US4768997A (en) * 1987-03-10 1988-09-06 Tecumseh Products Company Belt drive system for dual input transmissions/transaxles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0771969B1 (en) * 1995-11-01 2001-09-19 The Gates Corporation Tensioner with an adjustable stop for a power transmission belt and system
US5943986A (en) * 1998-02-06 1999-08-31 Generac Power Systems, Inc. Engine heat exchange apparatus with slide-mounted fan carrier assembly
US20050159271A1 (en) * 2004-01-15 2005-07-21 Banta George L.Iii System for controlling engine crankshaft deceleration by limiting engine retarding torque
US7077784B2 (en) 2004-01-15 2006-07-18 Cummins, Inc. System for controlling engine crankshaft deceleration by limiting engine retarding torque

Also Published As

Publication number Publication date
WO1991007611A1 (en) 1991-05-30
JPH0373622U (en)) 1991-07-24
JPH085301Y2 (ja) 1996-02-14

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